A URI-based content negotiation filter mapping a dot-declared suffix in
URI to media type that is the value of the Accept header
or a language that is the value of the Accept-Language header.

This filter may be used when the accetable media type and acceptable
language need to be declared in the URI.

This class may be extended to declare the mappings and the extending class,
foo.MyUriConnegFilter say, can be registered as a container request
filter. When an application is deployed as a Servlet or Filter such a filter
can be registered using the following initialization parameters: